Fix client-side memory leak caused by Grid events (#9103)

Refactors AbstractGridKeyEvent, AbstractGridMouseEvent and their
descendants to follow the pattern used in other GWT DomEvents.

Fixes #7633

1 files changed, 40 insertions, 0 deletions

diff --git a/uitest/src/main/java/com/vaadin/tests/components/grid/GridClientMemoryLeak.java b/uitest/src/main/java/com/vaadin/tests/components/grid/GridClientMemoryLeak.java
new file mode 100644
index 0000000000..7071f187bd
--- /dev/null
+++ b/uitest/src/main/java/com/vaadin/tests/components/grid/GridClientMemoryLeak.java
@@ -0,0 +1,40 @@
+package com.vaadin.tests.components.grid;
+
+import com.vaadin.server.VaadinRequest;
+import com.vaadin.shared.ui.ContentMode;
+import com.vaadin.tests.components.AbstractTestUI;
+import com.vaadin.ui.Button;
+import com.vaadin.ui.Button.ClickEvent;
+import com.vaadin.ui.Grid;
+import com.vaadin.ui.Label;
+import com.vaadin.ui.VerticalLayout;
+
+public class GridClientMemoryLeak extends AbstractTestUI {
+
+    private static final String INSTRUCTIONS = "This UI is for manually testing that the client side grid does not leak memory. "
+            + "Steps to take:\n"
+            + "\t1. Click the newGrid button 1-n times\n"
+            + "\t2. Capture a JS heap dump in your browser\n"
+            + "\t3. The heap dump should only contain 1 instance of each of the following:\n"
+            + "\t\tGrid, GridKeyDownEvent, GridKeyPressEvent, GridKeyUpEvent, GridClickEvent, GridDoubleClickEvent";
+
+    @Override
+    protected void setup(VaadinRequest request) {
+        final Label instructionLabel = new Label(INSTRUCTIONS,
+                ContentMode.PREFORMATTED);
+        final VerticalLayout layout = new VerticalLayout();
+        final Button btn = new Button("newGrid");
+        btn.addClickListener(new Button.ClickListener() {
+
+            @Override
+            public void buttonClick(ClickEvent event) {
+                layout.removeComponent(layout.getComponent(1));
+                layout.addComponent(new Grid<String>());
+            }
+        });
+        layout.addComponent(instructionLabel);
+        layout.addComponent(btn);
+        layout.addComponent(new Grid<String>());
+        addComponent(layout);
+    }
+}